package com.keshi.openplatform.payment.utils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.net.URLConnection;

public class HttpUtil {
    private final static int CONNECT_TIMEOUT = 5000; // in milliseconds
    private final static String DEFAULT_ENCODING = "UTF-8";

    public static String postData(String urlStr, String data){
        return postData(urlStr, data, null);
    }

    public static String postData(String urlStr, String data, String contentType){
        BufferedReader reader = null;
        try {
            URL url = new URL(urlStr);
            URLConnection conn = url.openConnection();//打开地址对应的连接
            conn.setDoOutput(true);//设置允许发送数据
            conn.setConnectTimeout(CONNECT_TIMEOUT);
            conn.setReadTimeout(CONNECT_TIMEOUT);
            if(contentType != null) //如果设置了请求数据的类型
                conn.setRequestProperty("content-type", contentType);//设置请求头
            OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream(), DEFAULT_ENCODING);//获取输出流,我们这边的输出流就是向服务器传递数据的流
            if(data == null)
                data = "";
            writer.write(data);
            writer.flush();
            writer.close();

            reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), DEFAULT_ENCODING));//获取输入流,就是服务器给我们返回的数据
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                sb.append(line);
                sb.append("\r\n");
            }
            return sb.toString();
        } catch (IOException e) {
            System.err.println("Error connecting to " + urlStr + ": " + e.getMessage());
        } finally {
            try {
                if (reader != null)
                    reader.close();
            } catch (IOException e) {
            }
        }
        return null;
    }
}
